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BITSAT2010MathematicsContinuity and DifferentiabilityActual

The value of ( | array ccc 1 & 2 & 3 -4 & 3 & 6 2 & -7 & 9 array | ) is

Options

  1. A213
  2. B-231
  3. C231
  4. D39

Correct answer

C. 231

Step-by-step solution

( aligned & | array ccc 1 & 2 & 3 -4 & 3 & 6 2 & -7 & 9 array |=1 | array cc 3 & 6 -7 & 9 array |-2 | array cc -4 & 6 2 & 9 array |+3 & | array cc -4 & 3 2 & -7 array | & aligned ) ( aligned & =1(3 9-6(-7))-2(-4 9-2 6)+3 & ((-4)(-7)-3 2) & =(27+42)-2(-36-12)+3(28-6)=231 aligned )

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